Calculating-machine.



PATENTED DEC. 20, 1904.

J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED OCT. 12, 1903.

13 SHEETS-SHEET 1 N0 MODEL.

No. 777,797. PATENTED DEC. 20, 1904. J. MALLMANN. OALGULATINGMACHINE.

APPLICATION FILED OGTllZ, 1903.

N0 MODEL. 13 SHEETS-SHEET 2 PATENTED DEC. 20, 1904.

J. MALLMANN. CALCULATING MACHINE.

APPLIGATION FILED 0GT.12, 1903.

13 SHEETS-SHEET 3 NO MODEL;

PATENTED DEC. 20, 1904'.

J. MALLMANN.

GALGULATING MACHINE.

APPLICATION FILED OCT 12, 1903.

clwmi'm 13 SHEBTSSHEET 4.

N0 MODEL.

No. 777,797. PATENTED DEC. 20, 1904. J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED 0GT.12, 1903.

13 SHEETS-SHBET 5 N0 MODEL.

3mm 4471/66 g PATENTED DEC. 20, 1904.

J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED OCT. 12, 1903,

13 SHBETS-SHBET 6 H0 MODEL No. 777,797. PATENTED DEC. 20, 1904.

v J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED 001212, 1903.

NO MODEL. 1s sums-sunny '1,

y .s. A I70 No. 777,797. PATENTED DEC. 20, 1904.

J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED OCT. 12, 1903.

N0 MODEL. 13 SHEETS-SHEET 8.

No. 777,797. PATENTED DEC. 20, 1904. J. MALLMANN.

CALGULATING MACHINE.

APPLICATION FILED 001212, 1903.

N0 MODEL. 13 SHEETS-SHEET 9.

PATENTED DEC. 20, 1904.

J; MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED 0013.12, 1963.

1s SHEETS-SHEET 1o.

H0 MODEL.

PATENTBD DEG. 20, 1904.

J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED 0OT.12, 1903.

13 BHEETSSHEET 11.

N0 MODEL.

PATENTED DEC. 20, 1904.

J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED OCT. 12, 1903.

13 SHBETSSHBET 12.

N0 MODEL.

PATENTED DEC. 20, 1904.

J. MALLMANN.

CALCULATING MACHINE.

APPLICATION FILED 0GT.12, 1903.

13 SHEETS-SHEET 18.

N0 MODEL.

tion of the machine.

UNITED STATES Patented December 20, 1904.

PATENT OFFICE.

CALCULATING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 777,797, dated December 20, 1904. Application filed October 12, 1903. erial No. 176,778.

' To all 1071,0717, it nutg concern:

' Be it known that I, J AMES MALLMANN, residing at Sheboygan, in the county of Sheboygan and State of Wisconsin, have invented a new and useful Improvement in Calculating-Machines, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

My invention relates to certain new and useful improvements in calculating-machines, and has for its object to reduce to a minimum the manipulating parts used in the operation of the machine.

A further object is to provide an automatic indicator to show the number of items added or listed automatically without the necessity of setting or' resetting the indicator.

This invention has as other objects the provision of improved working parts for accomplishing the above objects and the insuring of an absolutely perfect operation of the machine, notwithstanding carelessness or inexperience of the operator.

W ith the above primary and other incidental objects in view the invention consists of the devices and parts or their equivalents, as hereinafter set forth.

Referring to the accompanying drawings, forming a part hereof, and in which like characters of reference indicate the same parts throughout the several views, Figure 1 is a side elevation of a calculating-machine constructed in accordance with my invention, the casing being sectioned to expose the inner working parts to view. Fig. 2 is a similar view of the other side thereof, the casing being removed. Fig. 3 is a rear elevation of such machine without the casing. Fig. 1 is a plan view of the same machine with the carriage removed and portions of the casing and shield broken away. Fig. 5 is a longitudinal vertical see- Fig. 6 is a detail view of some of the principal operating members shown removed from the remainder of the machine, but in their relative positions, and showing parts seen in a section through the hammer-frame. Fig. Tis a detail sectional View of one of the actuating-bars with its tripframe in position. Fig. 8 is a transverse section thereof on the line 8 8 of Fig. 7. Fig. 9

is a rear elevation of the line of calculatingwheels and some of the members cooperating therewith, the actuating-bars and other parts beingsectioned. Fig. 10 is a detail view of one of the calculating-wheels and some of the members cooperatin g therewith, showing the detent side of said calculating-wheel. Fig. 11 is a plan view of one of the trip-frames. Fig. 12 is a plan View of the shifting-bar. Fig. 13 is a rear elevation thereof. Fig. 14 is a plan view of one of the slidable bars with some of its adjuncts. Fig. 15 is a detail view of the crank-arm by which the resetting operation is accomplished and some of the parts cooperating therewith. Fig. 16 is a detail view of such crank-arm with its engaging segment-plate as seen from the other side. Fig. 17 is a detail view of the upper parts of Fig. 15 looking at the rear ends of the slidable bars. Fig. 18 is a side elevation of the lifting-bar-operating mechanism with parts sectioned on line 18 18 of Fig. 19. Fig. 19 is a plan view of the lifting-bar-operating mechanism and the knife-edge-bar-opperating mechanism. Fig. 20 is a side elevation of the oscillating-plate-operating mechanism. Fig. 21 is a plan view thereof. Fig. 22 is a detail view of the shaft-shifting connection. Fig. 23 is a front elevation of the key-frame with the front plate broken away to show the stops for the slidable bars and the release-bar. Fig. 2 1 is a detail plan of the release-bar. Fig. 25 is a rear elevation of the key-frame with the back plate broken away to show the blank stop-levers and their connections. Fig. 26 is a rear elevation of the key-frame with a plate broken away to show the zero stop-levers. Fig. 27 is a plan view of the index-wheel and its operating parts. Fig. 28 is a front elevation thereof, and Fig. 29 is a detail section of one of the ribbon-reels and coacting parts.

In the figures, represents the casing of the machine, which may be of any desired construction adapted to suitably inclose the operative parts; but I prefer to employ the construction shown in the drawings, the particular features of which will be referred to herein as the description of the parts requires. The frame contained within the casing for supporting the operative parts of the machine may be of any desirable construction; but I prefer to employ the frame shown in the drawings, which consists in substantially duplicate side pieces 36 with cross-bars 37 secured to the front and back legs thereof to form supports for the frame. A crank-shaft 38 is journaled across the frame in bearings located on the rear under part of the side pieces 36, and rigidly mounted on its ends outside of said side pieces are u pwardly-extending crankarms 39 and 40. On opposite sides of the machine pitmen 41 and 42 are pivoted at their ends in the upper ends of crank-arms 39 and 40, respectively, and such pivot connections are produced by headed projections on the crank-arms sliding in longitudinal grooves of the pitmen in order that there may be a slight play or free motion between these parts. Coiled springs 43 also connect the pitmen and the crank-arms to give the headed projections of the crank-arms the tendency to move to the forward ends of the slots of the pit-men. That the headed projections are not shown in such position in the drawings is due to an overpowering opposite tendency which will be referred to later. The front ends of the pitmen 41 and 42 are connected by a cross-head or return-bar 44, which extends across the front of the machine and is slidable in horizontal elongated slots 45 in the side pieces36. The connections between the return-bar 44 and the pitmen 41 and 42 are pivotal, and the ends of said return-bar are held in position in the slots 45 by vertical pins 46 therethrough bearing on the outside of the side pieces 36. The return-bar 44 is limited in its inner movement by contact with the inner ends of slots 45 and in its outer movement by striking buffercushions 47 of rubber or other suitable material seated in the outer ends of slots 45.

As best seen in Figs. 3 and 5, the crankshaft 38 is provided with a number of upstanding serrated crank-lugs 48, and a bracket-rod 49, extending across the rear of the machine between projections of the side pieces 36, is provided with corresponding notched lugs 50. A number of strong coiled springs 51 are stretched between the lugs 48 and 50 and give the crank-shaft 38 a tendency to swing the crank-arms 39 and 40 rearwardly and seat the headed projections thereof in the rear end of the slots of the pitmen 41 and 42, notwithstanding the o-pposite tendency of springs 43.

A shaft 52 is journaled across the machine in boxes at the rear ends of the side pieces 36 and is provided with cranks 53 and 54, the former being connected by a link 55 with crank 39 and the latter being pivoted to the piston-rod of a dash-pot 56, which is pivotally mounted on a pin 57 between one side piece 36 and a lug on the rear cross-bar 37. By this means the rearward motion of the returnbar 44 is cushioned against a too-violent retraction by springs 51.

An operating-lever 58 has a sleeve 59 on its end, which loosely fits over the end of crankshaft 38, projecting beyond the crank-arm 40. This sleeve 59 is confined in its position by a large-headed screw 60, threaded in the end of shaft 38, and by passing through an opening in the casing 35 serves to locate the operating-lever 58 a suflicient distance from the machine proper to safely clear the casing 35 during its operation, as clearly seen in Fig. 4.

On the inner end of sleeve 59 and preferably formed integral therewith is an upw ardlyextending segment-plate 61, which has an inwardly-extending lug 62 at its forward edge capable of engaging the edge of crank-arm 40 under particular circumstances to be mentioned later. (See Fig. 16.) The upper part of the segment-plate 61 has a shoulder 63, normally engaging an outwardly-projecting lug 64 on the offset of crank 40 and held in such engagement by a coiled spring 65, connecting lug 64 with a rearward projection 66 of the segment-plate 61. By this means a forward movement of the operating-lever 58 will impart motion to the crank-shaft 38 and mechanism connected therewith through the lug connection 64; but a rearward movement of said operating-lever will cause the shoul- -der 63 to recede from lug 64, the crank 40 being prevented from following by reason of the engagement of the return-bar 44 with the inner end of slots 45.

Having now described the means for imparting a horizontal lateral reciprocation to the return-bar 44 in the grooves 45, the keyboard-controlling devices to be operated by such reciprocation will now be set forth.

A rectangular boxing or key-frame having a front wall 67, a back wall 68, side walls 69 and 70, top plate 71, and bottom plate 72 is secured upon the side pieces 36 of the main frame in a horizontal position. The top plate 71 is lowered in the walls of the frame, so that said walls project slightly above said top plate. A number of sliding bars 73 are mounted to slide upon the top plate 71 and are held in position by apair of guide-rods 74, extending lengthwise over the key-frame and secured to up wardly-extending lugs on the side walls 69 and 70. The slidable bars are confined within notches in the under edges of the guiderods 74 and are provided with undercuts at their two ends to enable them to slide without engaging their ends with the front and back walls 67 and 68 of the key-frame during their operative movements, but to engage the shoulders formed by these undercuts with said front and back walls at the limits of said operative n'iovements, as shown in Fig. Each slidable bar 73 has a spring 75 connecting it with the front guide-rod 74, so that they all have a tendency to normally rest at the forward limit of their movement.

A number of rows of keys 76, preferably nine in a row. as shown, have the lower vertical part of their stems passed through perforations in the top and bottom plates of the key-frame, such perforations of each row being grouped in sets of three, as shown. The key-stems between the top and bottom plates of the key-frame are surrounded by coiled springs 77, which give said keys an upward tendency by bearing against cross-pins 78 through the stems, which upward tendency is limited by the engagement of said cross-pin 78- with the under side of the top plate 71. In these lower vertical portions of the keystems are also located laterally-projecting pins 79, and directly therebeneath in the side of the slidable bar 73, which brushes against said key-stems, are inclined cam-slots 80, so that when any key is depressed against the tendency of its springs 77 the pin 79 thereof enters the inclined slot 80 beneath it and in its downward movement forces the slidable bar 73 to the rear against the action of its spring 75. This movement of the slidable bar 73 carries the other cam -slots 80 thereof out of the path of the pins 79 on the other keys of that row, so that when one of the keys of a row is depressed no other key thereof can be operated.

A number of upwardly-extending springpressed stops 81 are pivoted to the face of the front wall 67 of the key-frame in position to' stand in the path of the slidable bars 73. Normally they stand centrally 'in front of such slidable bars 73 in cut-away portions of said slidable bars and are pressed by their springs against the end projections 82 of the slidable bars formed by such cut-away portions; but when the slidable bars are forced to the rear by pressing the keys 76 the end projections 82 slide from the stops 81, and said stops spring in front of the end projections, and so prevent the slidable bars from returning.

A release-bar 83 slides longitudinally in a groove in the face of the front plate 67 and has forwardly-projecting lugs 84, extending between the stops 81. Such release-bar is spring-pressed to normally hold it in its inner position, as shown in Fig. 23, and when so located the lugs 84 thereof form abutments to limit the swing of the stops 81 when they are operated as above described, so that the upper ends of said stops stand in the proper positions to be engaged by the end projec tions 82 of the slidable bars 73. A front plate 8 1 stands in front of the stops 81 and the release-bar 83.

A double bell-crank or T-shaped lever 85 is pivoted at 86 to the side wall 69 of the keyframe and has on the end of its stem a beveled or inclined projection 87, fitting in a cone spondingly beveled or inclined rearwardlyextending lug 88 on the projecting end of the releasebar 83. A roller 89 is mounted on the end of the upper arm of the lever 85 and is engaged by a thumb-lever 90, pivoted to the side wall 69, when said thumb-lever is swung forwardly against the action of its spring. Such engagement causes the bellerank lever 85 to press downwardly on the cam connection with the release-bar 83 and cause said bar to be moved outwardly by the coaction of the inclined surfaces of projection 87 and lug 88, and so release all slidable bars 73 then held by the stops 81. The lower arm of bell-crank lever 85 is spring-actuated and is provided on its end with a roller 91, which stands in the path of a pivoted cam 92, carried by pitman 11, so as to be engaged by said cam and to operate the release-bar 83 during the backward movement of said pitman. During the forward movement of the pitman said cam on meeting the roller 91 swings to lift its tail end from its limitingpin, and so passes the roller 91 without operating the release-bar.

A U-shaped locking-bar 93 has its ends pivoted to the front lugs on top of the side walls 69 and 70 and swings down into contact with the upper surface of the slidable bars 73 to engage in front of or to the rear of knife-edge stop-pins 94 on said slidable bars, according to whether said bars are in their back or front positions. A spring 95 lifts the locking-bar normally from the path of the stop-pins 94, and a link 96, having a sliding connection with the thumb-lever at one end, is pivoted to the locking-bar, and by means thereof the said lockingbar may be depressed by forcing thumb-lever 9O backward until the link 96 has passed the line between its pivot and that of lever 90, when said lever strikes a stop-lug 97 and will remain in this position until forced forward into its normal position. By this means a number of keys may be depressed and then the thumb lever thrown backward to lock the slidable bars operated by those keys, and said bars will remain in their operated positions unaffected by the release-bar during any number of motions of the operating-handle until the thumb-lever is again thrown forward. The keys arranged in groups of three, as before mentioned, are regularly spaced at their upper ends by bendingthe stems of the outside keys of each group, as shown in the drawings, and these upper ends of the keys are provided with figured buttons, as usual, and are arranged in a single plane inclined forwardly. A shield 98 is mounted over the key-frame and has perforations through which the key-stems pass, and this shield serves to fill in an opening therefor in the casing 35, as seen in Figs. 1 and 1. As best seen in Fig. 5, each row of keys has located beneath it a longitudinal actuating-bar 99, the rear ends of said actuating-bars having a sliding bearing on a round rod 100, extending across the rear end of the machine from one side piece thereof to the other. and said rear ends of the actuating-bars 99 being confined in cross-grooves in the under side of a heavy rigid bridge-piece 101 just above rod 100 and also joining the side pieces of the frame. At their front ends said actuatingbars 99 are supported upon the rear edge of an oscillating plate 102, which is pivoted at its ends, at the forward edges thereof, to side pieces of the frame and is caused to oscillate from the inclined position shown in Fig. 5 to a horizontal position during the operation of the machine by means hereinafter described. Each actuating-bar 99 has depending from it just in advance of the rod 100 a hook 103. with a coiled spring 10 1 connecting it to a rod 105, extending across the machine nearer the front end thereof. The springs 104 give the actuating-bars 99 a forward tendency, pressing them against the return-bar fhwhere they are confined beneath a bar 106, which is sup ported from the oscillating plate a short distance above the same, and which bar is provided with notches on its under side to receive said actuating-bars. The actuating-bars 99 are further prevented from lateral displacement by passing them through notches in the under side of a guide-rod 107, extending across the front of the frame. From the bridgepiece 101 to their forward ends the actuatingbars 99 are provided with central longitudinal grooves 108, and rigidly secured in these grooves about midway the length of the actuating-bars are stop-plates having upwardlyextending stop-lugs 109, adapted during the movement of the actuating-bars 99 to travel directly beneath the ends of the stems of keys 76 and to engage with said ends of the stems of whichever keys are depressed to stop further forward movement of such actuatingbars 99.

' 1n the front part of the actuating-bars 99 are rack-bars 110, which are slidably seated within the grooves 108 and are given a tendency to slide rearward] y by coiled springs 111 connecting them with hooks on the front ends of said stop-plates. Each rack-bar 110 is held against accidental displacement and is limited in its longitudinal movement in the groove 108 by a depending lug 112, extending through a slot in the bottom of the groove 108 and having a pin therethrough bearing on the bottom of the actuating-bar 99, and also by a pin 113 extending across the forward end of groove 108, beneath which slides a reduced forward projection of the rack-bar 110.

Loosely mounted on the shaft 114: are a number of caleiiilating-wheels 115, (see Fig. 5,) each provided with suitable index characters, preferably numerals from 1 to 9, inclusive, and rigidly secured to the side of each calculating-wheel 115 is a pinion 115, normally meshing with the rack-bar 110 therebeneath. By this means the longitudinal movement of the actuating-bars 99 is transmitted to the calculating-wheels as long as the forward ends of said actuating-bars are held up by the oscillating plate 102, so that the pinions 115 mesh with the rack-bars 110; but

when said oscillating plate is swung downward by means to be now described the rackbars are free of the pinions, and movement of the actuating-bars does not affect the calculating-wheels.

Referring to Fig. 1, a shaft 116, capable of a sliding longitudinal movement by means to be described later, is journaled across the machine and carries at one end a segmental gear 117, meshing with a rack-arm 118, which is pivoted to the crank-arl'n 4C0 and which is held in mesh with said segmental gear 117 by means of a grooved guide-roller 118, mounted on the side piece 36 of the machine-frame. The oscillation of the crank-shaft 38 is through this connection transmitted to the shaft 116.

A double segmental cam-frame 119 (see Figs. 20 and 21) is rigidly mounted on shaft 116 and preferably comprises a cast supporting and base portion with a sheet-metal traveling surface. The traveling surface of this double cam-frame, as shown in the drawings, is provided with straight end portions 120 at the same distance from the shaft 116, with an intermediate arc-shaped portion 121 concentric with the shaft 116 and inclined connecting cam portions 122 between the end portions 120 and the arc-shaped portion 121. Opposite side posts 123 stand up from the base portion of the cam-frame and have pivoted to their ends bridge-levers 124 and 125, the former having a spring 126 normally holding its rear end against the back cam 122 and the latter having a spring 127 normally holding its forward end against the front cam 122. The outer surface of each bridge-lever is formed of two arcs of radii approximately equal to the distance between the center of the shaft 116 and the end portions 120, so that when either end of said bridge-lever bears against an end portion 120 the are at that end thereofwill be approximately concentric with shaft 116.

An angular arm 128 is carried by a sleeve 129, which is loosely mounted on a shaft 130 and which also carries a slotted arm 131, having a sliding connection with the headed projection 132 on the end of an arm 133, rigidly connected with the oscillating plate 102. The angular arm 128 has on its free end a pair of oppositely-disposed rollers 134 and 135, capable of riding on the bridge-levers, one only at a time, the operative engagement with their bridge-levers being shifted from one to the other as the shaft 116 is moved longitudinally. Normally the shaft 116 is in such position that roller 134 operates on bridgelever 12%,, and then the movements of the operating-lever produce a downward motion to the oscillating plate 102 at the start of the forward stroke of the operating-lever by reason of the roller 134 passing down the front cam-surface 122. Then near the end of said forward stroke said oscillating plate 102 is again raised by the roller traveling up the rear cam-surface 122 onto the end surface 120 by lifting bridge-lever 124 against its spring action. On the return stroke of the operating-lever the roller 134 rides on the curved outer surface of the bridge-lever 124 and when passing the pivot thereof swings said bridge-lever 124 against the action of its spring, so that its forward end engages the forward end portion 120, to which said roller passes. During this return stroke the distance between the shaft 116 and the roller 124 has remained approximately constant, and

therefore no motion is given to the oscillating plate 102. When the shaft 116 is moved lengthwise out of its normal position. the double cam-frame 119, being moved therewith, brings the other roller, 135, into operative engagement with bridge-lever 125, and as said bridge-lever is held by its spring in the opposite position to that of bridge-lever 124 it will produce an operation of the oscillating plate 102 just the reverse of that described for the other bridge-leverthat is, on the forward stroke of the opera tinglever said oscillating plate will remain unmoved, the roller 135 being traveling over the bridge-lever 125; but on the return stroke said oscillating plate is first lowered and held so during the travel of the roller 135 over the aresurface 121 and then raised to its normal position. It is obvious on referring to Figs. 5 and 6 that the movements of the oscillating plate 102 serve to raise and lower the ends of actuating-bars 99 to bring their rack-bars 110 into and out of mesh with the pinions 115, so that the longitudinal movements of the said actuating-bars are only transmitted to the calculating-wheels 115 when said oscillating plate is raised. To prevent accidental turning of the calculating-wheels 115, a universal' detent-bar 136 is pivoted to the outside of lugs 137 on side pieces of the frame justin front of the key-frame, and said detent-bar is provided with a series of forwardly-extending detents or pawls 138, adapted to engage with the teeth of the pinions 115. A coiled spring 139 connects a forwardly and upwardly extending arm 140 on the universal detentbar 136 with a front part of the frame and gives said detent-bar a tendency to rock forward and seat its pawls between the teeth of the pinions 115 A lever 141 is pivoted to the forward part of the frame and has a depending lug bearing on the oscillating plate 102 and a rearwardly-extending arm having a bearing on the under side of arm 140, so that when the oscillating plate 102 is in its upper position and the rack-bars 110 are in engagement with the pinions 115 the universal detentbar 136 is pressed upwardly by the lever 141 until the pawls thereof clear the pinions 115; but when said oscillating plate 102 is lowered to release the rack-bars 110 from "the pinions the lever 141 lowers also and permits spring 139 to draw the detent-bar 136 downward to engage all of the pinions 115, and so accidental turning of the calculating-wheels is prevented.

A resetting-bar 142 is pivoted at its ends to the inner sides of the lugs 137 and has a series of forwardly-projeeting arms 143,adapted to engage cam-lugs 144 on the sides of calculating-wheels 115 opposite to the pinions 115 thereof. These lugs are inclined one way to allow of the turning in the direction they are moved by the normal operation of the actuating-bars 99 without hindrance by the arms 143, but adapted to be engaged by said arms when turned in the opposite direction by means hereinafter explained, and when so engaged the calculating-wheels are set at zero. At one end the resetting-bar 142 is provided with a forwardly-extending lug 145, upon which a lift-spring 146 bears to give said resetting-bar a downward spring tendency.

As far as described it will be understood that one of the keys 76 being depressed the end of its stem projects downward into the path of the stop-lugs 109 of the actuating-bar therebeneath, and when the operating-lever is moved forward it turns shaft 116 to cause the cam mechanism carried thereby to first lower the oscillating plate 102 and release the rackbar 110 from engagement with the pinion 115. This takes place during the travel of the headed projection of crank-arms 39 and 40 in the slots of the pitmen 41 and 42. Then the cross-head 44 moves forward and the actuating bar follows it, being moved by its spring 104 until one end of the lugs 109 engages the end of the projecting stem and stops the forward movement of the actuating-bar. At the end of the forward stroke of the operating-lever and during the return stroke the rack-bar 110 is again held in mesh with its pinion, and when the cross-head or return-bar 44 engages the end of the actuating-bar said actuating-bar is returned to its original position, meanwhile turning the calculating-wheel to an extent corresponding with the length of its movement from the position in which it was stopped by the key-stem to its normal position. The location of the stop-lugs 109 is such that one lug can be engaged by the stems of one group only, and the distance of movement of the actuating-bar between the positions of stoppage by the successive keys is the same throughout, so that the degree of rotation imparted to the calculating-wheel is regular with the several keys. (See Figs. 25 and 26.)

On the rear face of the back wall 68 of the key-frame are pivoted a number of stop-levers 147, which because of their function during the operation will hereinafterbe termed zero stop-levers. These Zero stop-levers 147 are spring-pressed in a direction to cause their upper reduced ends to bear with their beveled edges upon the inclined rear ends of the sl1dable bars 78, which form cams 148 for swinging said Zero stop-levers on their pivots when the slidable bars 73 are moved longitudinally. At their lower ends the zero stop-levers 147 stand close to the actuating-bars 99 and may engage cam-lugs 149 on the sides of said actuating-bars 99 to prevent said actuating-bars from moving forward farther than this point of engagement. Any slidable bar 73 which has been operated by one of its keys in mov ing backward presses its zero-lever 147 away from the cam-lug 149, so that the actuatingbar 99 is free to pass.

Behind the back wall 68 of the key-frame is a plate 150, having a longitudinal groove near its upper edge in which slide a series of blocks 151, having pivoted thereto a series of stop-levers 152, hereinafter termed blank stop-levers, because of their functions during the operation of the machine. The blank stop-levers 152 are also pivoted to the plate 150 and have their upper reduced ends engaging their beveled edges against the cam-surface 148 of the slidable bars 73. The first two blank levers 152 are pivoted to a single block 151 and are spring-pressed toward the others, which are each pivoted to a separate block 151. By this arrangement the operation of either of the first two slidable bars 73 will by means of the cam end 148 thereof swing both the first and second blank stoplevers 152 by reason of their being connected by the first block 151, and an operation of any other slidable bar will, through the abutment of the several blocks 151, swing all of the blank stop-levers up to the one directly operated upon by the said slidable bar. The lower ends of the blank stop-levers 152 engage the cam-lugs 149 normally, and so prevent the movement of the actuating-bars 99. A back plate 153 is located behind the blank stop-levers 152.

The transfer mechanism by which each calculating-wheel 115 carries forward its tens on the next calculating-wheel will now be described with reference to Figs. 5 and 6 and 7 to 11. On a shaft 154, just beneath the oscillating plate 102, are loosely mounted a se' ries of trip-frames 155, which are each preferably formed of a blank of sheet metal, with aflat portionhavingadownwardly-bent pivoteye 156 on each side of one end and its other end terminating in a short downwardly-directed spur or tooth 157 on one side and an upwardly-bent angular stop-arm 158 on the otherside. These trip-frames have their pivoteyes loosely mounted on shaft 154 and normally stand with the angle portion of their stop-arms 158 in the path of the pins 159, projecting from the sides of the rack-bars 110 and through openings 160 in the side walls of grooves 108. This engagement with pins 159 normally holds the rack-bars 110 in their forward position against the action of their 155 are sup- '1 and engage the downwardlyextend1ng lugs springs 111. The trip-frames ported in their normal position just described by trip-levers 161, which are pivoted at their lower ends between spacing-sleeves 162 to a shaft 163 and have engaging teeth 164 near their upper ends, on which the spurs 157 of the trip frames 155 are pressed by coiled springs 165, connecting them with a rod 166. The upper end of each trip-lever 161 extends in close proximity to the periphery of the calculating-wheel 115 which is adjacent to the one whose rack is held forward by the trip-frame supported by such trip-lever and is adapted to be engaged by a lug 167 on said periphery and forced rearward thereby against the action of its spring 168, connecting it with rod 166. In so swinging backward the trip-lever 161 releases the spur 157 of the trip-frame from its engaging tooth 164 and permits the spring thereof to lower said trip-frame until the spur 157 engages a shoulder 169 on the trip-lever. This downward movement of the trip-frame 155 is sullicient to remove the angular portion of the stop-arm 158 from the path of pin 159, so the rack bar 110 is drawn to the rear by its spring and in doing so turns its calculatingwheel 115 one figure. .It is obvious that this operation will be repeated with each complete rotation of any calculating-wheel 115, and the lug' 167 is so positioned on the periphery of the calculating-wheel that its operation of the trip-lever takes place simultaneously with the appearance of the Zero-mark thereof on the readingline. In order to restore the tripframes 155 to their original position after the operation just described, a lifting-bar 170 is pivoted on the shaft 154 and has upwardlyextending lugs 171 to engage the under side of the flat portion of the trip-frames 155. An arm 172 extends rearwardly from the liftingbar 170 and carries on its end a roller 173, (see Figs. 18 and 19,) engaging a spring-actuated pivoted cam-tongue 174. mounted upon a segment 175, which is carried by the sliding shaft 116. During the forward stroke of the operating-lever 58 the segment rocks forward, and the roller 173 rides up the incline of cam tongue 174, meanwhile lifting all fallen trip-frames155 by the lifting-bar 170, until near the end of said stroke, when the roller drops from the pivot end of the camtongue to the surface of the segment and returns to its original position, bearing on said segment-surface and lifting the cam-tongue against its spring action during the return stroke of the operating-lever. Near the segment 175 is another segment 176, also mounted on the sliding shaft 116 and carrying a pivoted spring-actuated cam-tongue 177, on which rides a roller 178, carried on the end of an arm 179, extending from a knife-edge bar 180, which is pivoted across the frame. The roller 178, operating as just described of roller 173, causes the knife-edge bar to swing 112 of those rack-bars which have been released by the trip-frames 155 and press them forward into their normal position. The segment 176 is set slightly in advance of segment 175, so that the return of the rack-bars 110, as above described, will just precede the re turn of each trip-frame 155, and the latter when locked in position by the spur riding up the inclined lower edge of the engaging tooth 164 until again snapping into its seat on said engaging tooth will again engage the pin 159 and retain the rack-bar in its normal position. It will be noted that the return movement of the rack-bars just mentioned is accomplished during the forward stroke of the operating-lever while the actuating-bars are lowered and said rack-bars do not mesh with pinions 115. It will be further noted that the width of the tread of the segments 175 and 176 is such that the rollers 173 and 178 travel thereon when the shaft 116 is moved longitudinally and the cam-tongues are out of the path of said rollers.

As seen in Fig. 1, a backward movement of the operating-lever 58 after it has reached its normal position carries segment-plate 61 away from lug 64 against the action of spring and causes the rear edge of said segment-plate 61 to bear upon a roller 181, carried by an arm 182, which is rigidly mounted on a shaft 183, and to move said arm 182 backward, turning shaft 183 therewith. At the other end of said shaft, as seen in Fig. 2, is an arm 184, having pivoted to its end a link 185. which is also pivoted to a lever 186, and in turn this lever 186 is pivoted to the frame at 187 and is retracted by the spring 188. A link 189 connects lever 186 with one arm of a bellcrank lever 190, pivoted to an extension of the frame and having its other arm rounded, as shown in Fig. 22, and located within a peripheral groove in the shaft 116, so that motion imparted to lever 186 causes the bell-crank lever 190 to move the shaft 116 longitudinally in its bearings, and this shaft is provided with an enlarged end 191 to limit said movement.

Aspring-pressed catch-lever 191 is pivoted to the frame and has on one end a shoulder 192, adapted to engage with a lug 193 on lever 186 when said lever is moved out of its normal position. At its other end catch-lever 191 has a pivotal connection with the slotted end of a link 194, which is also pivoted to the stem end of the doublebell-crank lever 85, so that'after the lever 186 has been thrown forward by a rearward motion of the operatinghandle and engaged there by the catch-lever 191 at the next forward operation of the operating-handle the bell-crank lever 190 on being swung by the cam 92 lifts the front end of catch-lever191 and releases lever 186, so that its spring 188 returns it to its normal position, restoring the shaft 116 to its normal position.

As seen in Figs. 3 and 15, the. arm 182 is cured to the sides of the frame, and has a depending bail-rod 201. Upwardly-extending lugs 202 are carried at the rear ends of the slidable bars 7 3, and when any of said bars 73 are forced rearwardly the lugs 202 thereof engage the bail-rod 201 and swing it backward, thereby raising the hooked rear end of catch-lever 196, so that it stands in position to engage lug 195 and prevent the backward operation of arm 182. As long as one of the slidable bars 73 is in its rearmost position the hook of catch-lever 196 is held raised, and in order that it shall not lower between successive operations of the machine a spring-actuated hooked detent 203 is pivoted to the frame and is adapted to engage a pin 204 on the link 197 when said link is lowered and prevent the hooked end of catch-lever 196 from dropping by its own weight. On the inner side of pitman 42, near the rear end thereof, is a lug 205, which engages the detent 203 during the forward movement of the operating-lever, and so releases the pin 204 and permits the hooked end of lever 196 to drop if there is no slidable bar in its rear position to support it from the bail-rod 201. Thus the rearward or setting operation of the operating-lever is prevented, except after a stroke of the said operating-lever for which no key was depressed.

Pivoted at their lower ends on a shaft 206 are a number of trip-levers 207, one for each calculating-wheel 115 except the first three. These trip-levers 207 have notches at their upper ends forming lugs or shoulders adapted to be engaged by the lugs 167 on the periphery of the calculating-wheels 115 on the first movement of said calculating-wheels in turning from the zero mark. The backward movement thus imparted to the trip-levers 207 sends the rods 208, which are pivoted to their upper ends, backward, sliding in the shiftbar 209, by which they are supported. Normally the ends of rods 208 extend between the lower ends of the zero stop-levers 147; but this backward movement thereof carries them between the blank stop levers 152 as well.

A bell-crank lever 210, as clearly seen in Figs. 12 and 13, is pivoted to the frame and has one arm pivoted to a link 211, which is also pivoted with a slot connection to lever 186. The other arm of said bell-crank lever 210 has a coiled spring 212 connecting it to the shift-bar 209 and has adepending side lug 213, which is adapted to engage the end of said shift-bar and return it to its normal po- 

